Derrick.



Patented Jan. 21, 1913.

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DERRICK.

AYPLIUATION FILED FEB. 17, 1912.

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DERRIGK.

APPLIOATIONIILB D FEB. 17, 1912.

Patented Jan. 21, 1913.

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COLUMBIA I'LANWRAPH co.. WASHINGTON. l

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THOMAS S. lVIoLENIDON, OF NEAR WACO, GEORGIA.

DERRICK.

Specification of Letters Patent.

Patented Jan. 21,1913.

Application filed February 17, 1912. Serial No. 678,223.

To all whom it may concern:

Be it known that T, THOMAS S. MoLnN- non, a citizen of the United States, residing near Waco, in the county of Carroll and State of Georgia, have invented new and useful Improvements in Derricks, of which the following is a specification.

This invention relates to portable derricks or elevators designed principally for domestic purposes and particularly designed for use in pant-ries or storage rooms, where materials such as sack flour, preserves or the like can be conveniently elevated with a minimum expenditure of power.

Another object of the invention is to provide an apparatus which will be simple in construction and which may be manufactured of stock materials whereby its cost of production will be reduced to a minimum.

In the drawings forming a portion of this application and in which like letters of reference indicate similar parts in the several views :Figure 1 is a perspective View of the derrick. Fig. 2 is a vertical section therethrough. Fig. 3 is a horizontal section through the elevator car and through the elevator guides. Fig. 4 is a perspective view of the brake for the derrick. Fig. 5 is a vertical section through a portion of the derrick showing the application of the brake thereto and illustrating the same in an applied posit-ion.

The derrick or elevating structure comprises a base frame which includes the spaced side bars 1, the front bar 2 and an intermediate brace bar 3. Casters 5 are suitably mounted in the bars 1 of the said base frame whereby the structure can be readily moved from place to place as desired. The standards 6 are secured at their lower ends to the side bars 1 and at the upper ends the standards are connected together by a horizontal beam 7. Diagonal brace bars 8 are connected at their upper ends to the standards 6, and at the lower ends the said bars are connected to the members 1. of the base frame.

Vertical guide strips 9 are secured to the inner sides of the standards 6 and arranged thereon so that their edges protrude beyond the edges of said standards 6 so that the edges of the latter and the said protruding edges of the strips 9 combine to form in effect substantially guide rails for the ele vator car herein shown. This elevator car comprises a floor or platform 10 which has formed therein vertical grooves 11 through which the guide strips 9 extend, the walls 12 of the grooves being adapted to slide against the surfaces or vertical edges 13 of the guide strips. Horizontal heads 1st are also slidably mounted with the guide strips :9 and as illustrated these heads are connected to the ends of the platform 10 by the vertical members 15. A pair of such members is located at each end of the platform and the inner portions of the members are slidable against the surfaces 16 of the guide strips.

Pulleys 18 are mounted beneath the beam 7 and extending over the pulleys are hoisting cables 19. The upper ends of the cables are secured at 20 to the heads 14. The opposite ends of the cable are wound about a winding drum as at 22. This drum is journaled in the diagonal bars 8 of the derrick and at one end the drum supports an operating handle 23 which may be manually operated to cause the hoisting cables to be wound upon or unwound from the drum. A ratchet wheel 24 is secured to the winding drum at one end thereof and it has engaged therewith a gravitating dog 25 whereby the drum will be held against retrograde movement. At one side the members 15 of the elevator car are connected together by the bar 26 and at the opposite side the companion members 15 are connected together by the strips 27. These strips have their ends connected by the buckle 28 whereby one side of the elevator car can be opened to facilitate the loading and unloading of the same.

With a view to preventing the accidental movement of the derrick during the hoisting operation of the elevator I provide a brake frame 29 which is adjustable vertically beneath the base frame of the derrick, being provided preferably with the vertical stems 30 which are mounted in the sides 1 of said base frame. The frame 29 is provided with depending stems 31 which are slidable in brackets 32 in the base frame of the derrick, and as shown these stems are embraced by helical springs 33 whose upper ends are engaged against the bottom of the frame 29. Brake shoes 34L are secured to the stems 31 and they are preferably provided with yieldable surfaces 35 which may be brought to bear against the surface of the ground when the frame 29 is lowered. Actuating mechanism for lowering the frame 29 comprises a shaft 36 which is secured in the base frame of the derrick and which has mounted thereon an eccentric 37 which is disposed above the horizontal member 38 on the said frame 29. The said eccentric is connected as at 39 with the-actuating lever 40- at the front of the derrick plane. This lever may be manually operated so as to lower the frame 29 with the resultant engagement of the surfaces 35 against the ground. This construction positively holds the derrick against movement under the tendency of the casters hereinbefore described. Means such as ll are employed for holding the lever 40 in its adjusted position whereby the brake shoes are held positively in frictional contact with the ground.

I claim In combination with a truck having a wheeled base frame provided with a plurality of brackets, of a braking means therefor, said means including a frame, brake shoes located within the brackets and disposed beneath the second frame, yieldable means disposed between the underneath portion of the last mentioned frame and the lower horizontal portion of said brackets for holding the second frame in a released position and movable actuated means disposed above the second frame and operable to move the same to a set position against the tension of the springs.

In testimony whereof I atfix my signature in presence of two witnesses.

THOMAS S. MoLENDON.

Witnesses i J. J. RIGsBY, M. A. SMITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. i 

